
In one study, researchers asked 76,904 people to report the glucosamine, chondroitin and NSAIDs they had taken during the previous 10 years.
Doctors found no links to chondroitin or NSAIDs, but compared to those who did not take glucosamine, those who had taken glucosamine at least four days per week for at least three years were 51 percent less likely to develop lung cancer (adeno-carcinoma).